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2 entries under geohistory topic. ×

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eocene extinction(noun, name, extinction)
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paleocene first appearance(noun, animal, appearance)
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APASmart Define. (1970). sophiornithidae thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/sophiornithidae/thesaurus/broader
ChicagoSmart Define. 1970. "sophiornithidae thesaurus" https://smartdefine.org/sophiornithidae/thesaurus/broader (accessed October 1, 2026).
HarvardSmart Define 1970, sophiornithidae thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/sophiornithidae/thesaurus/broader>.
MLASmart Define. "sophiornithidae thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/sophiornithidae/thesaurus/broader>